Printing cylinder appliance



Feb. 5, 1935. OTT 1,989,889

PRINTING CYLINDER APPLIANCE Filed Sept. 22, 1932 2 Sheets-Sheet INVENTOR ATTORNEY .Feb. 5, 1935. D. J, sco TT 1,989,889

PRINTING CYLINDERx PPTJIANCE FiledSept. 22, 1 932 2 Sheets-Sheet 2 INVENTOR Jamd ISM/Z www n 8 ATTORNEY Patented Feb. 5, 1935 UNITED STATES FATE QFF ECE V 1,989,889 r PRINTENG CYLINDER APPLfANCE David J. Scott, Plainfield, N. J.

Application September 22, 1932, Serial No. 634,311

20laims. '(Cl.101378) Printing plates for cylinders of newspaper printing machines are now fastened to the cylinder by means of clamps slidable in longitudinal grooves of the cylinder andengaging the curved ends of the plates, the straight ends of the plate being left free.

Due to the high speed of the printing cylinders it has been found that there is a tendency on the part of the straight ends of the plates to be moved outwardly by centrifugal force, and the main object and feature of this invention is to provide means whereby this tendency may, be checked, and to do this without interfering with the construction of plate clamps now employed in connection with the curved ends of the plate.

In the accompanying drawings the invention is disclosed in several concrete and preferred forms in which:

Fig. 1 is a view, partly in side elevation and partly-in section, of a printing cylinder embodying the invention;

Fig. 2 is a view, also partly in side elevation and partly in section, of the right-hand end of the cylinder of Fig. 1, and looking in the direction of arrow 2 of Fig. 1;

Fig. 3 is a transverse sectional View substantially on the plane of line 33 of Fig. 1;

Fig. 4 is a transverse sectional view substantially on the plane of line 44 of Fig. 1;

Fig. 5 is a transverse sectional view substantially on the plane of line 5-5 of Fig. 1;

Fig. 6 is a fragmentary view in elevation and on an enlarged scale of a portion of the righthand end of Fig. 1;

Fig. '7 is a fragmentary transverse sectional View substantially on the plane of line 7-7 of Fig.

Fig. 8 is a fragmentary sectional View substantially on the plane of line 8-8 of Fig. 6;

Fig. 9 is a view similar to Fig. 6 but showing a modified form of the invention; and

Fig. 10 is a transverse sectional view substantially on the plane of line 1010 of Fig. 9.

1 indicates a printing or plate-carrying cylinder such as is employed in newspaper printing machines, and provided, as usual, with a plurality of segmental printing plates 2 and 3 one circumferentially behind the other in spaced relation at both ends. As shown, there is a plurality of rows of such plates, here four in number and, in the form shown, the two rows at the right hand end of the cylinder are intended to be staggered circumferentially with respect to the two rows at the left hand end (in, Fig. 1) of the cylinder in. a manner well understood the art. The usual means or clamps to engage the taper on the curved ends of the plates are employed, here taking the form of a center clamp or'clamps 4, end clamps as 5 and intermediate clamps 6. The cylinder is provided with longitudinal grooves as 7 to permit of adjustment of the intermediate and end clamps. These clamps all engage the printing plate below the printing surface thereof.

In addition to the taper surfaces on the curved ends of the plates, there are here provided projecting lips on thes'traight ends of the plates belowtheir printing surface, and there are means carried by the cylinder intermediate the plates and below their printing surface to overlap the "lipson the straight ends of adjacent plates. In

the form of the invention shown in Figs. 1 to 8 inclusive, the lips on the straight ends of the plates are indicated at 8 and are in spaced relation with respect to each other and have outwardly facing taper surfaces 9. The overlapping rneans on the cylinder here consist of a Y in spaced relation with respect to each other longitudinally of the cylinder as well as in spaced relation to the cylinder. It will be observed that taper surfaces 9 and 10 are complementary, and that while 10 are outwardly beyond 9, they are nevertheless below the printing surface of the plates. Surfaces 10 may be carried by a supporting member 11 secured as by means of screws 12 in groove 13 of the cylinder. When it is desired to plate the cylinder, said plate is placed on the side of the cylinder as indicated in Fig. 6 with 9 and 10 in staggered relation, after which the plate is moved endwise of the cylinder a slight distance to bring the complementary taper surfaces vinto engagement.

A more simple form of the invention is shown in Figs. 9 and 10. Here the straight end of the plate has a continuous projecting lip 14, and the cylinder carries a continuous strip or member 15. Members 15 form open slots above the surface of the cylinder but below the printing surface of the plates, and when the plate is placed against the side of the cylinder the projecting lips of the plate simply enter said open slots.

I claim:

1. In a printingmachine, a printing cylinder, members carried by the cylinder forming open slots above the surface and longitudinally of said cylinder but below the printing surface of a plate to be carried by the cylinder, a segmental plate having projecting lips below its printing surface and along its straight ends, said open slots receiving the projecting lips of the plate when the latter is placed on the cylinder, and means carried by the cylinder to engage the curved ends of the plate.

2. In a printing machine, a printing cylinder, a plurality of inwardly facing taper surfaces in spaced relation with respect to each other longitudinally of the cylinder as well as in spaced relation to the cylinder but below the printing surface of a plate to be carried by the cylinder,

a segmental printing plate having projecting lips in spaced relation with respect to each other below its printing surface at its straight ends, said lips having outwardly facing taper surfaces complementary to and below the plane of those on the cylinder, whereby the cylinder may be plated by placing the plate on the side of the cylinder with its projecting lips intermediate the taper surfaces of the cylinder and then by moving the plate endwise of the cylinder bring the complementary taper surfaces into engagement, and means carried by the cylinder to engage the curved ends of the plate.

DAVID J. SCOTT. 

